On Lazy Commutation

  • Authors:
  • Nachum Dershowitz

  • Affiliations:
  • School of Computer Science, Tel Aviv University, Ramat Aviv, Israel

  • Venue:
  • Languages: From Formal to Natural
  • Year:
  • 2009

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Abstract

We investigate combinatorial commutation properties for reordering a sequence of two kinds of steps, and for separating well-foundedness of unions of relations. To that end, we develop the notion of a constricting sequence. These results can be applied, for example, to generic path orderings used in termination proofs.